218204354810172 has 12 divisors (see below), whose sum is σ = 509143494557096. Its totient is φ = 72734784936720.

The previous prime is 218204354810161. The next prime is 218204354810179. The reversal of 218204354810172 is 271018453402812.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×218204354810172² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218204354810179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9091848117079 + ... + 9091848117102.

Almost surely, 2^{218204354810172} is an apocalyptic number.

It is an amenable number.

218204354810172 is an abundant number, since it is smaller than the sum of its proper divisors (290939139746924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218204354810172 is a wasteful number, since it uses less digits than its factorization.

218204354810172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18183696234188 (or 18183696234186 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 48.

The spelling of 218204354810172 in words is "two hundred eighteen trillion, two hundred four billion, three hundred fifty-four million, eight hundred ten thousand, one hundred seventy-two".